A more thorough explanation:

Term: Correi Credendi
Definition: Correi Credendi is a term used in Roman law to refer to joint creditors. It means that there are multiple people who are owed money by someone else. These people are called "correi credendi" or "active correality." When they ask the debtor for payment, the debtor only needs to answer once for all of them. For example, if three people loaned money to someone, they would be correi credendi. If they asked the debtor for payment, the debtor would only need to answer once for all three of them.
Example: Three friends loaned money to John. They are correi credendi. When they ask John for payment, he only needs to answer once for all three of them.